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Their purpose is to attenuate an incoming flood peak to a flow level that can be accepted by the downstream channel. It may also delay the timing of a flood peak so that its volume is discharged over a longer time interval.Areas Benefiting from Flood Defences shows those areas that would benefit from the presence of formal flood defences in the event of flooding from rivers with a 1% (1 in 100) chance in any given year, or flooding from the sea with a 0.5% (1 in 200) chance in any given year. If the defences were not there, these areas would be flooded. Flood Zone 3 is the Agency's best estimate of the areas of land with a 1% (1 in 100), or greater, chance of flooding each year from rivers, or with a 0.5% (1 in 200) chance, or greater, of flooding each year from the sea. 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